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Reports redundant <code>Stream</code> or <code>Optional</code> calls like <code>map(x -&gt; x)</code>, <code>filter(x -&gt; true)</code> or
redundant <code>sorted()</code> or <code>distinct()</code> calls.
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<p>Note that a mapping operation in code like <code>streamOfIntegers.map(Integer::valueOf)</code>
  works as <code>requireNonNull()</code> check:
  if the stream contains <code>null</code>, it throws a <code>NullPointerException</code>, thus it's not absolutely redundant.
  Disable the <b>Report redundant boxing in Stream.map()</b> option if you do not want such cases to be reported.</p>
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